i will be pouring my floor next month and i am pushing 4'' piles [ pipe] in certain areas of the floor. i was going to get mounting measurements for my lift and push a pile at those locations and weld a plate that would end up being flush with the top of floor so i would be mounting directly to the pile. is this overkill ? am i overthinking this?
piles for 2 post lift ??
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piles are mainly for load factors , a car lift with a full size truck on it, doesn't really weigh that much, bigger concern would be the tilt of the weight in the air. that why they don't recommend anything under 4 inches and no control joints close to lift. I think its a over kill but also I think its a great idea. I would do it too
Yeah. with many (most?) lift installations, the stress on the concrete isn't from the weight of the lift/vehicle at all. It's the lateral force and how it acts on the joint where the post meets the floor -- the thing trying to tip the post of the lift over, like a tree falling. So the area where you need strength is the lateral strength of the concrete -- like it's a horizontal beam that's part of the structure lifting the load. So if you do anything that compromises that 'corner joint' between the post (vertical) and the floor (horizontal), you're asking for trouble. You don't want the post and the footing you put under it all falling over like a tree in the middle of an otherwise sturdy floor.
(Disclaimer: I'm no engineer. Not by a country mile.)
(Disclaimer: I'm no engineer. Not by a country mile.)
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wssix99
Well-known member
I'm not an engineer, but I do have several engineering degrees. 
^^^ Jack's advice is right on. Think about the stress a car puts on a concrete pad. The weight of the vehicle is spread over 4 tire contact patches. As long as the steel plate at the bottom of the lift is the same of greater surface area as your tire contact patches, the concrete is stressed the same or less than a vehicle parked on it.
If your pile is even a little off center, it could put more stress (think leverage) on the concrete when it bends from off centered weight on the lift. So, the safest thing to do is install the concrete as per the manufacturer's instructions. (If putting a pile in was a good/beneficial thing to do - the manufacturer would tell you to do it.)
^^^ Jack's advice is right on. Think about the stress a car puts on a concrete pad. The weight of the vehicle is spread over 4 tire contact patches. As long as the steel plate at the bottom of the lift is the same of greater surface area as your tire contact patches, the concrete is stressed the same or less than a vehicle parked on it.
If your pile is even a little off center, it could put more stress (think leverage) on the concrete when it bends from off centered weight on the lift. So, the safest thing to do is install the concrete as per the manufacturer's instructions. (If putting a pile in was a good/beneficial thing to do - the manufacturer would tell you to do it.)
tatra
Well-known member
so what about pulling pots?.........are these not sujected to the same forces?...........
mrobins297aaa
Well-known member
over kill, what exactly do you think is going to happen?
usually these lifts use 3/4" anchors, check the pull out or shear values on these anchors I'm sure it in the 10's of thousands of pounds for just one. usually each side has 6 or 8 of them per side.
are you afraid that a big chunk of concrete is going to bust off and the lift is going to fall over with the concrete still attached to the bottom?..........never happen at least not with concrete in good condition.
usually these lifts use 3/4" anchors, check the pull out or shear values on these anchors I'm sure it in the 10's of thousands of pounds for just one. usually each side has 6 or 8 of them per side.
are you afraid that a big chunk of concrete is going to bust off and the lift is going to fall over with the concrete still attached to the bottom?..........never happen at least not with concrete in good condition.
Wastedwagesracing
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I'm going to be in the same situation here shortly. I thought of sinking in piles. But doing further reading ran across this idea. Of pouring like a grade beam 18"wide and 24 " deep. I have pondering if that is a good idea. I'd leaning toward just pouring the area of the lift like 8" thick and calling it good.
mrobins297aaa
Well-known member
when i poured my floor we made a 48"x48" x6" thick area where the post were going to be and then put wire mesh in the whole floor.
just to clarify, i'm not worried about the load factors at all. the tree comparison is a good one and that is my worry. in the oilpatch we will push/vibrate piles to refusal, usually 10'-15'. we will mount communication towers up to 60' high with solar panels, so done right these will tolorate massive side to side loads but sounds like 6'' of concrete is the key and my entire floor is going to be 6''.